Rolling cutter drill bits

Details Rolling cutter drill bits Rolling cutter drill bits

1995-07-28

1998-03-10

Footland, Lenard A.

Bearings

Rotary bearing

Roller drill bit

384 92, F16C 1704

Patent

active

057253137

ABSTRACT:
A rolling cutter drill bit comprises a body and three legs, each leg having a cantilevered bearing spindle, a rolling cutter rotatably mounted on the bearing spindle, lubricant delivering means within the beating spindle, and a floating thrust bearing element configured to carry onward thrust loads from the rolling cutter onto the bearing spindle. Each floating thrust bearing element is formed of a wrought alloy material consisting primarily of chromium carbide and cobalt and having a yield strength of less than 120,000 psi and a ductility of at least 4%, both at room temperature.

REFERENCES:
patent: 3235316 (1966-02-01), Whanger
patent: 3384426 (1968-05-01), Schumacher
patent: 3720274 (1973-03-01), McCallum
patent: 3721307 (1973-03-01), Mayo
patent: 4074922 (1978-02-01), Murdoch
patent: 4323284 (1982-04-01), Childers et al.
patent: 4410284 (1983-10-01), Herrick
patent: 4413918 (1983-11-01), Thomas
patent: 4439050 (1984-03-01), Garner
patent: 4641976 (1987-02-01), Kon
patent: 5161898 (1992-11-01), Drake
"Metal Handbook" (9th Edition, vol. 3) pp. 257-268 and 589-591.

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